Messages in this thread | | | Date | Fri, 12 Feb 1999 16:29:55 +0100 (CET) | From | Mike Galbraith <> | Subject | Re: Weird tcp performance differences with 2.0 and 2.2 kernels |
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On Fri, 12 Feb 1999, Andi Kleen wrote:
> On Fri, Feb 12, 1999 at 08:09:43AM +0100, Mike Galbraith wrote: > > On Fri, 12 Feb 1999, David C Niemi wrote: > > > > > > > > Users are reporting odd and unpleasant FTP hangs on ftp.tux.org as well, > > > which is now running 2.2.1 with the latest fixed wu-ftpd. These problems > > > did not occur with the 2.0.36 kernel but did with 2.2pre6; I'm not quite > > > sure whether they occured in the 2.1.126-8 era because the UP flu made > > > things unusable back then. > > > > > > The hangs do not ALWAYS happen, they are more likely on more remote > > > connections and on connections via firewalls (in the latter case the > > > connections work fine for a similar FTP server running 2.0.36 and used to > > > work fine for ftp.tux.org prior to 2.2.x. > > > > ftp.porcupine.org is one of these for me.. _always_ times out when I > > do 'dir' in the /pub/security directory. (tcpdump attached). If I.. > > echo 0 > /proc/sys/net/ipv4/tcp_timestamps > > ..it works fine. Anyone know why? > > Probably your terminal server has broken VJ compression. Try turning VJ > compression off on your link.
It's the same either on or off. This is something that snuck in fairly recently. One day I was trying to get to ftp.x.org, and this happened. I figured they :) were having troubles and ignored it. When 'their' problem didn't go away in a couple of days, I got suspicious. When the same exact failure happened with porcupine, I remembered hearing about /proc/sys/net/ipv4/tcp_timestamps and gave it a shot. This snuck in after a kernel upgrade, not an isdn upgrade fwiw.
As luck would have it, I just got done cleaning out about 30 older kernels due to space troubles, and no longer have anything older than 2.1.132 :( I'll boot what I have and see if it goes away at some point.
-Mike
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